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Am J Physiol Regul Integr Comp Physiol 273: R725-R730, 1997;
0363-6119/97 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 273, Issue 2 725-R730, Copyright © 1997 by American Physiological Society

ARTICLES

Selective breeding for diet-induced obesity and resistance in Sprague-Dawley rats

B. E. Levin, A. A. Dunn-Meynell, B. Balkan and R. E. Keesey
Neurology Service, Department of Veterans Affairs Medical Center, East Orange, New Jersey 07018, USA.

In outbred Sprague-Dawley rats, about one-half develop diet-induced obesity (DIO) on a diet relatively high in fat and energy (HE diet). The rest are diet resistant (DR), gaining weight and fat at the same rate as chow-fed controls. Here we selectively bred for high (DIO) and low (DR) weight gainers after 2 wk on HE diet. By the F5 generation, both male and female inbred DIO rats gained > 90% more weight than inbred DR rats on HE diets. Even on low-fat chow diet, DIO males were 31% and females were 22% heavier than their respective DR rats. Full metabolic characterization in male rats showed that weight-matched, chow-fed DIO-prone rats had similar energy intakes and feed efficiency [body weight (kg0.75)/energy intake (kcal)] but 44% more carcass fat than comparable DR-prone rats. Their basal plasma insulin and glucose levels in the fed state were 70 and 14% higher, respectively. But, when fasted, DIO-prone oral glucose tolerance results were comparable to DR-prone rats. Chow-fed DIO-prone males also had 42% greater 24-h urine norepinephrine levels than DR-prone males. During 2 wk on HE diet, DIO rats ate 25% more, gained 115% more weight, had 36% more carcass fat, and were 42% more feed efficient than comparable DR rats. Fasted HE diet-fed DIO rats developed frank glucose intolerance during a glucose tolerance test with 55 and 158% greater insulin and glucose areas under the curve, respectively. Thus the DIO and DR traits in the outbred Sprague-Dawley population appear to be due to a polygenic pattern of inheritance.


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